Learn SugarCRM which is built on PHP; SugarCRM devs are rare, in high demand, and very highly paid (I just hired a full remote sr php dev at 145k with full benes/10% starting bonus).
Total comp yes, not salary like OP is talking about. Only a handful of companies have total comp that doubles base thanks to RSU and stock, which a vast majority of the worlds ~25MM programmers do not participate in.
It's amazing how skewed the HN crowd is on developer comp. You'll find that $140-150k is senior range for a vast majority of the U.S. software engineering market.
We’re always looking btw.